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Fast twitch fiber formation or recruitment..?

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    Question Fast twitch fiber formation or recruitment..?

    What is more important to strength training? The creation of more fast twich fibers or recruitment of the ones that already exist through adaptation of the CNS?

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    Thats a tough one, but I'd have to go with the recruitment of more existing fibers
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    Quote Originally Posted by Vieope
    What is more important to strength training? The creation of more fast twich fibers or recruitment of the ones that already exist through adaptation of the CNS?
    When you say "creation" of fibers are you referring to those fibers that tend to be more intermediate, but through strength training with heavy weights, "morph" into more fast twitch fibers?

    Since you cannot really control the above phenomenon you should focus on trying to recruit as many fast twitch fibers as you can that already exist.





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    Quote Originally Posted by gopro
    When you say "creation" of fibers are you referring to those fibers that tend to be more intermediate, but through strength training with heavy weights, "morph" into more fast twitch fibers?

    Since you cannot really control the above phenomenon you should focus on trying to recruit as many fast twitch fibers as you can that already exist.

    Oh GP, but you can control the above with the proper training. I would still agree that it is more important to recruit the ones you already have since it is generally the limiting factor.
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    Fiber recruitment is a very misunderstood phenomena. Most people think that heavy lifting recruits fast twitch fibers and higher reps slow twitch.

    The recruitment of fibers is based upon the recruitment of motor units. Smaller motor units tend to consist of slow twitch fibers which have a low threshold of recruitment. Thus smaller units are recruited first with larger one's coming if required. So, heavy lifting works both slow and fast twitch, not only fast twitch.

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    Quote Originally Posted by Dale Mabry
    Oh GP, but you can control the above with the proper training. I would still agree that it is more important to recruit the ones you already have since it is generally the limiting factor.
    I hope you are not saying the hyperplasia can be controlled ?
    William F. Buckley describes a conservative as, "someone who stands athwart history, yelling Stop." - and then proceeds to drag civilization back to times best left in history's dungheap.

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    Quote Originally Posted by LAM
    I hope you are not saying the hyperplasia can be controlled ?
    No, I don't think he's speaking about hyperplasia, but about the mechanism by which the body will adapt certain fibers to become fast or slow twitch based on the type of training the body is faced with regularly. So, he is talking about the already existing fibers changing from intermediate to either fast or slow twitch, not actual fiber splitting.

    And no, this cannot be "controlled." It can be influenced, but not controlled.





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    Ok...that's what I thought but wasn't sure

    Yea, there are definitely no guarantees when it comes to converting fiber types
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    Thanks for the answers.

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    It can be controlled, but not finely controlled. By training the proper energy system you end up with more of the enzymes associated with that energy system in the muscle. So by doing this, you are controlling it since the more oxidative enzymes you have in the area, the more type IIa fibers will act like type I fibers and with more glycolytic enzymes in the area the more they will act like type IIb.
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    Quote Originally Posted by Dale Mabry
    It can be controlled, but not finely controlled. By training the proper energy system you end up with more of the enzymes associated with that energy system in the muscle. So by doing this, you are controlling it since the more oxidative enzymes you have in the area, the more type IIa fibers will act like type I fibers and with more glycolytic enzymes in the area the more they will act like type IIb.
    You see, what you call control I call influence. While you can "do" the "right" things in order to try and make something happen physiologically/chemically in the body, you cannot control whether it will actually happen or to what extent. You can do all the right things to spur on hypertrophy, but that does not mean it will happen. We can use what we know about the human body to try and influence outcomes, but we cannot control it.





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    Semantics my friend, semantics. You could argue that you can't "control" what you eat, only influence it as well. We are saying the same thing I believe.
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    Quote Originally Posted by Dale Mabry
    Semantics my friend, semantics. You could argue that you can't "control" what you eat, only influence it as well. We are saying the same thing I believe.

    Almost, but not quite. You CAN control what you eat (forget about the psychological aspect)...if you want to eat 10 oz of chicken breast you can measure it out and eat it.

    You can lift a weight of your choice for 10 reps to try and influence growth in a given bodypart, but you cannot control that growth, b/c if we could, we would all be huge.

    There are things that are done consciously that are in our control, but there are functions of our body that are out of our control, but that we can try and influence based on what we know.





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    Go pro.. i just got my bottle of cex..can i ask u one thing about it..what do u mix it with is it ok to mix with my protein shake?

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    Quote Originally Posted by justin22
    Go pro.. i just got my bottle of cex..can i ask u one thing about it..what do u mix it with is it ok to mix with my protein shake?
    I mix it in water, but you can put it in a shake if you wish.





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